Toughness and technology come together in an ocean-ready diesel propulsion engine with Northern Lights’ state-of-the-art features - the Lugger L6125H.Real horse power, for real world applicationsBased on a heavy-duty off-road engine block, the L6125H is designed and built for the unforgiving marine environment. The L6125H cranks 470 Horsepower (high output) at 2300 RPM. Continuous duty operators will appreciate the engine’s ability to crank 350 HP at a low 1800 RPM. Keeping revolutions low minimizes wear and tear, as does the attractive power-to-weight ratio of 6.1 lbs/HP and the engine’s impressive torque rise. Big power in a manageable packageThe anvil-tough four-cycle, in-line six cylinder L6125H displaces 674 cid, but fi ts in a footprint suited to most engine rooms making it a strong re-power candidate. The liquid-cooled turbocharger maximizes the engine’s power potential while ensuring operator safety.

Lugger’s trademark features Lugger by Northern Lights is the brand trusted by the world’s most demanding boat builders. Lugger’s custom marinization features are designed for long-life and high-performance, with no sacrifi ce to onboard comfort or fuel economy. Cast iron exhaust manifold, cupro-nickel heat exchanger with removable end covers, individual cylinder heads: all the trademarks of Lugger’s world class engineering are present in this remarkably small and light-weight package. Fuel economy and cleanliness in a Lugger Designed for clean, effi cient use, the L6125H features an industry-renowned high pressure common rail (HPCR) fuel delivery system. Legendarily simple to maintain and serviceEase of maintenance has been a Lugger hallmark for over fi fty years. All service points are on a common, easily accessed side. Belts and hoses are minimized. If it isn’t there - it can’t break. Replaceable wet liners allow in-boat rebuilds.

Durable, white polyurethane paint increases visibility and cleans easily. All this amounts to less time on maintenance and more time on the water. Power Take Off options increase versatilityYou can take power off the front end of your L6125H with an optional electric clutch, pump mount PTO - ideal for powering your hydraulic system.Fully tested and backed by the industry leader All Luggers are dyno tested after marinization, then tested again upon installation of transmission. Luggers are backed by a three year limited warranty, with no hour limits in the fi rst year; making the L6125H the best built, best backed and most easily serviced propulsion system on the market.

L6125H

L6125H Service points are grouped on this side for ease of maintenance.

• Large cast aluminum expansion tank. No welds to break.

• Cupro-nickel heat exchanger.Removable covers for cleaning.

• Sea water aftercoolerenhances performance.

• Large air fi lter helps silence intake.

• Easily accessible bronze raw water pump.

350 / 1800 rpmContinuous Duty

440 / 2200 rpmMedium Duty 470 / 2300 rpm

High Output

HORS

EPOW

ER

• Electronically controlled, high pressure common rail (HPCR) fuel injection system.

• Spin on fuel fi lter.

• Spin on oil fi lter.

• Large capacity oil pan

• Beltguard offers protection to operator.

• Sparkling white IMRON® poly-urethane paint fora tough fi nish.

• ECU protected by steel drip shield.

These are the features thaEngine Block• Komatsu six cylinder, four cycle, four

overhead valve, heavy duty industrial engine block.

• Replaceable wet cylinder liners for heat dissipation, enhanced life expectancy and lower rebuild costs.

• Single piece forged steel crankshaft with induction

hardened journals. Rigid seven bearing crankshaft support.

• Robust forged steel connecting rods.

• Roller cam followers reduce friction and extend life of valve train.

• Four valves per cylinder for superior “breathing.” Double valve springs. Replaceable valve seats and guides. Intake valve rotators provide even wear.

• Two thermostats for safety, quick warm- ups and even temperature control.

• Zinc anodes help prevent electrolysis in heat exchanger cooling system.

Air System• Large capacity aftercooler uses seawater

to cool the intake air compressed by the turbocharger. This dense, cool

air provides more effi cient combustion, increases horsepower, and meets emissions regulations.

• Turbocharger is liquid cooled for safety. No need to carry heat blankets that can become oil soaked and combustible.

• Large capacity air fi lter and closed crankcase breather (Airsep® system).

L6125H Non-Service Side

• Jacket water cooled turbo-charger.

• Base engine is six-cylinder, four cycle, four overhead valve heavy-duty industrial block.

• Optional wet and dry exhaust elbows available.

• Large cast aluminum expansion tank. No welds to break.

• 24 volt starter.

• 24 volt battery charging alternator.

• Jacket water cooled, cast iron exhaust manifold. Two pass coolant fl ow for even temperature control.

• Closed loop crank case vent for clean engine room.

Cooling System• Jacket water heat

exchanger has fl exible impeller-type seawater pump. Heat exchanger housing has removable end caps. Cupro-nickel tube bundle can be removed for cleaning without disturbing other cooling system components.

• Centrifugal jacket-water pump is gear driven, eliminating issues caused by drive belt failures.

• One piece, cast iron exhaust manifold is jacket-water cooled. No welds to fail. No gasketed connections between water and exhaust passages reduce chances of water entering the cylinders.

• Coolant connections are pipe with o-ring seals to eliminate hoses.

t make a good engine block into a great marine engine.

Use these components to make your Lugger into an integrated power system that fi ts your vessel’s special requirements.

• Flybridge and auxiliary instrument panels with wire harness plug-ins are easy to install.

• Engine mount stop-start panel.

• 10, 20 and 40 foot wiring harness extensions.

• High output primary alternators:

24V-75A and 24V-100A.

• Add a second alternator:

12V-65A, 12V-140A, 24V-35A,

24V-75A.

• DC electrical systems. 24V

isolated ground.

• Wet Exhaust: 6” and 8” stainless steel wet exhaust elbow. Rotate 0-15° and 15/75° from vertical.

• Dry exhaust: 5” and 6” dry exhaust elbows. 5” and 6” stainless exhaust fl ex. Turbo outlet weld fl ange.

• Oil change pump for engine and gear.

• Duplex Racor primary fuel fi lters.

• Spare parts kit.

• Twin Disc or ZF gears.

Trolling valves. Shaft couplings.

• Coolant level sensor.

• Chrome valve covers.

• Vibration isolating fl exible engine mounts. Sets of 4 or 6.

• Crankshaft pulleys: 8” 4-A/B

or A grooves.

• Front PTO with 12 or 24V

electric clutch and SAE C splined,

2 or 4 bolt pump mount pad.

Provides up to 1,000 ft-lbs of torque for hydraulics.

L6125H Accessories and OptionsFuel System• Electronic fuel injection for improved economy and

faster starts - even cold.• HPCR for better fuel

atomization.• Electronic unit

injectors are placed in the center of the cylinder for the most effi cient fuel spray pattern and improved economy.

• Fuel system design is self-venting

• Large spin-on fuel fi lter element.

• Gear driven, positive displacement mechanical fuel transfer pump.

• Remote mounted primary fuel fi lter.

Lubrication System• Gear type high capacity oil pump. • Internal oil passages to prevent leaks.• Plate type, jacket water oil cooler with thermostat.

Cooler controls oil temperature. Cooler is integrated into block to eliminate hoses.

• Full fl ow, spin on oil fi lter.

Electrical System• 24 volt, negative ground, marine grade electrical

system includes starter and 24V/40A battery charging alternator. See Accessories column for more alternator options.

• The Engine Control Unit (ECU) is housed in a water resistant module, and controls the electronic fuel injection system. The ECU supplies a SAE J1939 engine information data stream that is accessible through a CANbus plug for the Electronic System Profi lier (ESP) monitor screen. Service diagnostics and error codes are automatically stored.

Special Features• White polyurethane paint for long life fi nish and service visibility.• Operator’s and parts manuals standard on CD/ROM. Printed versions available as options.

Performance Data and Specifications

L6125H

Output rating Continuous Medium High Output

FWHP (kW) 350 (261) 440 (328) 470 (350)

Maximum RPM 1800 2200 2300

Cylinders/Confi guration/Cycle All: 6 / Inline / 4

Displacement CID (ltr) All: 674 (11)

Aspiration All: Turbocharged - Aftercooled

Bore x Stroke in (mm) All: 4.92 x 5.91 (125 x 150)

Cooling (Heat Exchanger)

Seawater pump fl ow - US gpm (lpm) 58 (219) 71 (269) 74 (280)

Heat rejection to sea water - BTU-min 8040 11350 13390

Freshwater system capacity - US gal (ltr) All: 9 (34)

Raw water intake dia. - in (mm) All: 2 (51)

Raw water discharge dia. - in (mm) All: 2 (51)

Max. raw water temp. at inlet -°F (°C) All: 86° (30°)

Electrical

Voltage All: 24V standard ground

Min. battery capacity All: 200 amp hours - 800 CCA

Battery cable size up to 10 ft run All: 00

Standard panel harness length - ft (m) All: 20 ft (6m)

Air and Exhaust

Engine air consumption - cfm (m3/min) 590 (16.7) 936 (26.5) 1024 (29)

Exhaust gas fl ow at - cfm (m3/min).. 1715 (49) 2323 (66) 2508 (71)

Exhaust gas temperature -°F (°C) 961 (516) 777 (414) 759 (404)

Max. exhaust back pressure - in (mm) H20 All: 30 (762)

Suggested dry exhaust I.D. - in (mm) All: 6

Suggested wet exhaust I.D. - in (mm) All: 8

Fuel and Oil

Minimum fuel suction line - in (mm) All: 0.5 (12)

Minimum fuel return line - in (mm) All: 0.38 (10)

Maximum fuel pump head - in (m) All: 39 (1)

Crankcase oil capacity - US qts (ltr) All: 34 (32)

Other Data

Engine rotation (facing fl ywheel) All: Counter-Clockwise

Flywheel housing size All: #1 SAE

Optional front PTO size SAE # - inch All: 4 -8”, 4 -10” or 3 -11.5”

Maximum operating angle any direction All: 35° for less than 2 minutes

Maximum installed operating angle All: 10° rear down - 0° front down

Heat Exchanger Weight - without gear 2867 lbs (1300 kg)

L6125H Specifi cations and Installation Data L6125H Performance Data

Dealer 4420 14th Ave. NW., Seattle WA 98107 Tel: (206) 789-3880 • 1-800-762-0165 • Fax: (206) 782-5455

Information and dimensions subject to change without notice. Northern Lights and Lugger are registered trademarks

of Northern Lights, Inc. © 2011 All rights reserved. Litho USA. L731 05/11 www.northern-lights.com

Contact factory for current installation drawings and performance data and torque curves.

All specifi cations and dimensions are preliminary and are subject to change without notice.

Dimensions inch (mm)

A length 69 (1758)

B width 33.0 (840)

C height 45.0 (1143)

D mounts 44 (1115)

E mounts 26.5 (673)

High Output Rating1 FWHP / kW / @ rpm 470 / 350 / 2300Medium Duty Rating1 FWHP / kW / @ rpm 440 / 328 / 2200Continuous Duty Rating FWHP / kW / @ rpm 350 / 261 / 1800

1735

1708

1681

1654

1627

1181

1572

1545

1518

1491

1464

1437

15 16 17 18 19 20 21 22 23

15 16 17 18 19 20 21 22 23

15 16 17 18 19 20 21 22

15 16 17 18 19 20 21 22

A

B

C

A. Maximum torque at flywheel.

B. Flywheel power. Prop shaft power is 3-3.5% lower due to marine reduction gear power loss.

C. Fuel consumption based on theoretical propeller HP draw.Your fuel consumption will vary higher or lower depending on your vessel and operating conditions.

Rating Defi nitions: Following are the defi nitions of duty ratings for Luggers. Please contact your Lugger representative to verify your application.High Output: Based on a load factor of 20% or less. A maximum of fi ve minutes at full throttle, followed by not less than ten minutes at cruise power or below. For applications up to 200 total hours per year.Medium Duty: Based on a load factor of 66% or less. A maximum of two hours at full throttle, followed by at least one hour at cruise power or below. For applications up to 4000 total hours per year.Continuous Duty: Based on a load factor of 100%. No limit on time at full throttle. No limit on hours per year.